Rotary engine.



Patented Nov. 25, |902.

s. .1. JnHNsuN. ROTARY-ENGINE.

lAppxicasim'med Mar. 22, 19in.)

4 Sheeis-Sheek 3,

(No Model.)

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ROTARY ENGINE. Application med Man 22, 1'9Q1.)

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y UNITED STATES PATENT FFIOE.

siNOLAIR J. JOHNSON, OF NUTLEY, New JERSEY.

ROTARY ENGINE.

SPECIFICATION forming part of Letters Patent No. 714,582, dated November2.5,' 1902.

Application tiled March 22, 1901. Serial No. 52.297. (No model.)

\ in Nutley, in the county of Essex and State of New Jersey, haveinvented certain new and useful Improvements in RotaryEngines,

of which the following is a specification.

This invention relates to rotary engines, the object vOt the inventionbeing to provide an improved rotary engine simple and durable inconstruction and economical to manu;

facture and use, the organization being such that the engine will worksubstantially noiselessly and with little friction and substantiallywithout vibration, particularly when running at a high speed.

4A further Object of the invention is to pro-` vide an engine soorganized that it will convert the maximum amount of the actuatingmedium into available energy and be adapted to have the supply of suchactuating medium regulated at diierent times, so as to use th expansiveforce of such medium.

This improved rotary engine comprises in a general way two rotarymembers, one adapted to form appearing and disappearing abutments-thatis, to make a partial rotation to every complete rotation of the othermember and at each partial rotation to remove an abutment and close theinlet-port and the,

outlet-port and again open the inlet-portand the outlet-port, replacingthe abutment-and is herein shown as means adapted to be'paw tiallyturned by the piston at each rotation, such partial turning cutting on?the supply of motive medium during the first part of` the movementclosing the outlet-port and removing the abutment and during the latterpart of such movement opening the inletport and the outlet-port andreplacing the abutment. It in practice may comprise a cylinder, a`chamber opening into said cylinder, a piston mounted in such cylinderand provided with an arm fitting properly against the walls of suchcylinder, and an intermittent rotary member mounted in the said chamber,said rotary member fitting properly against the walls of said chamberadjacent to the opening between the cylinder and said chamber and havingrecesses in its periphery positioned in such a manner that when saidrotary member is at rest one of the unre `cessed portions of theperiphery adjoins one side of the opening between the cylinder and thechamber and a similar portion adjoins the edge of the other side of saidopening and an intermediate similar portion forms the abutment and restsagainst the piston while the arm of the piston bears against theboundary of such recesses, such boundary supplementing the walls of thecylinder, the organization of the mechanism being such that the armpassing across the opening between the cylinder and said chamber willcause such member to make a partial rotation. Such member is provided ineach recess with a port, one of which when said rotary member is at restserves as an inlet-port and another as an outlet-port. Means to `preventthe rotation of this rotary member at predetermined periods areprovided.

This improvement is susceptible of various changes in form, proportion,and the details of construction without departing from the principle orsacrificing any of the advantages thereof, and a full disclosure of oneof the adaptations of the invention is shown in the drawingsaccompanying and forming part ot' this specification, in which- Figure lis a vertical transverse sectional view of the improvement. Fig. 2 is aplan view of the same, partly in section and with parts broken away.Fig. 3 is a detail view in perspective of the conduit. Fig. iis a detailview in perspective of the piston and piston-arm. Fig. 5 is a detailView in perspective of a part of the improvement. Fig. 6 is a detailview in perspective of the hub and wheel. Fig. 7 is a detail view inperspective of another part of this improvement. Fig. S is a plan view,partly in section and with parts broken away, of the improvement in amodified form. Fig. 9 is a detail Aview in perspective of a piece of thepacking. Fig. 10 is a vertical transverse` sectional viewof anothermodilication of the improvement. Fig. 1l is a top plan view, partly insection and with parts broken away, of the modification of theimprovement shown in Fig. 10; and Figs. 12, 13, and 14 are diagrammaticviews of the piston and hub and rotary member, showing their relativepositions at different periods in the rotation of the piston.

Similar characters oi reference designate 1.. le l corresponding partsin the different iiguresof the drawings.

In the construction shown two intersecting cylinders 2 and 3 are mountedon a suitable bed-plate 4. A rotatable shaft 5 is concentricallymoun-ted in cylinder 2 and in practice may be provided with suitablestuffingboxes (not shown) between such shaft 5 and the walls of theopenings in the cylinder-head through which it passes and with suitablebearings. If desired, such shaft 5 may be provided at one end with adriving-pulley 6 or other suitable means for the transmission of power.In the cylinder 3 is arotaryymember, shown here as comprising arotatable tubular hub 7, which is shown concentrically mounted in saidcylinderand in practice may be provided with suitable stuffing-boxes(not shown) between such hub 7 and the walls of the openings in the endsof the cylinder 3 through which such hub 7 passes, and with suitablebearings. The cylinders 2 and 3 may have a transverse partition 8,dividing their interiors into two compartments each 9 and 10 and 11 and12, respectively. The

` compartment 11 may be of greater diameter than the rest of suchcylinder 3. In practice packing '.(not shown) may be provided betweenthe shaft 5 and the hub 7 and the walls of the openings in the partition8 through which they pass.

In the compartment 10 of the cylinder 2 a piston 13 is keyed orotherwise suitably secured to the shaft 5 or .made integral therewith.Such piston 13 may comprise a cylindrical portion 14, which is smallerin diameter than the cylinder 2, in which it rotates, and an arm 15,shown having substantially straight sides, which projects from suchcylindrical portion 14 and extends to the inner periphery of suchcylinder 2, such arm 15 litting properly against the walls of saidcylinder 2 and shown in cross-section with its outer end curved. In thecompartment 9 of the cylinder 2 a di'sklb', having an arm 17, is

keyed or otherwise suitably secured to said shaft 5 or made integraltherewith, substantially approximately inthe same radial positionrelative to such shaft 5 as the piston 13. One side of said arm 17 andthe adjoining portion of the disk 16 may be cut away to permit thepassage of the disk 18, hereinafter described, and said arm 17 may beprovided near its outer end on such cut-away portion with a stud 19,here shown cylindrical.

In the compartment 11 of the cylinder 3 a disk 18, substantially of thesame diameter as the interior of said compartment 1l, is keyed orotherwise suitably secured to the hub 7 or made integral therewith. Theperiphery of the disk 18 is cut away at intervals to form curvedrecesses 21, which engage the periphery of the disk 16 for anappreciable time during the rotation of the piston 13 and dur- 4ing suchengagement prevent the hub 7 from turning. Between each pair of suchrecesses 2l a slot 22, with relatively long sides tancylinder 3.

Ygential respectively to the circle described by opening between thecylinders 2 and 3. These slots `22 in the form of engine shown are raldial to the hub.

In the compartment 12 of the cylinder 3 a rotary member 23, shown hereas of such diameter that its periphery rolls on the cylindrical portion14 of the piston 13 and fits properly against the walls of its cylinderadjacent to the opening between the cylinders 2 and 3, is keyed orotherwise suitably secured to or made integral with the hub 7. Suchmember23 has recesses 24 in its periphery, each of curved formation fromend to end and of suitable depth and shape to engage and fit properlyagainst'the curved end of the piston-arm 15 during its passage acrossthe' opening between the cylinders 2 and 3, preventing the escape of anyof the motive medium around the arm 15 during that part of its rotation.In each recess 24 is a port 25, one of which serves as an inlet-port andanother as an outlet-port when the rotary member is at rest.

The recesses 24 are equal in number and placed substantially in the samerelative radial position with the hub 7 as the slots 22. The parts ofthe member 23 between the recesses 24 may be termed abutments, and whensaid member 23 is at rest one of these abutments will be in the path ofthe arm 15 on the center line of the cylinders 2 and 3, and the twoadjoining abutments will then be adjacent to the edges of the openingbetween the cylinders 2 and 3.

In the construction shown a conduit 26, having one end closed, projectsinto the hub 7 and is provided on its exterior surface on opposite sideswith longitudinal recesses 27 and with a port 28 on one sideintermediate such recesses 27. The recesses 27 communicate with suitableexhaust connections. (Not shown.) The conduit 26 communicates with thesource of supply (not shown) and may be in practice supported in anysuitable way and is here shown mounted on a U-v shaped bracket 29,secured to the end of the This conduit 26 may be turned by a handle 30,working in a slot 31 in one arm of the bracket 29, to bring the port 28op` posite one of the ports 25 when such port 25 is then the inlet-port,which will present one of the longitudinal recesses 27 to another of theports 25, which is then the outlet-port.

The operation of this engine, it will be observed, is as follows: Theparts being in the operative position, (shown in Fig. 1,) the con` duit26 is turned so as to make the port 28 register with one of the ports25, which is then the inlet-port. This permits the medium to enter thecylinder 2 and pass around IOO IIO

the piston 13 `until it reaches the Working face of the arm 15, when itforces the arm 15 from right to left, the stud 19 entering one of theslots 22 in the disk 18, causing the hub 7, with the member 23, torotate. It will be observed that the sides of the slot 22 beingtangential to the circles described by the i outer and inner sides ofthe stud 19, the disk 18, member 23, and hub 7 Will begin to rotatesubstantially ininitesimally slowly as the stud 19 enters the recess 22,increasing in rapidity until the stud 19 is in a line with the center ofthe cylinders 2 and 3, when such rotation will be at its maximum, andwill again decrease until as the stud 19 leaves the slot 22 it will beagain infinitesimally slow. This fact will substantially prevent any jaras stud 19 enters slot 22 and as the periphery of the disk 16 and thecurved recess 210i? the disk 18 come into engagement. i As the stud19moves in the slot 22 the unrecessed portion of the disk 18 rotates inthe cut-away portion of the disk 16,.`such unrecessed portion of thedisk 18 passing out of the cut-away portion of the disk 16 as the stud19 leaves recess 22. The engagement of the disk 16 and the recess 21prevents the `rotation of th'e member 23 during the rotation ofthepiston 13 until the stud 19 again enters another slot 22. As thepiston-arm 15 comes to the opening between the cylinders 2 and 3 themeans to revolve the member 23 has brought one of the recesses 24 to theside of the opening, so that the piston-arm 15 iits properly in suchrecess 24, and the boundary of the said recess 24 is so constructed andthe means of rotating the member 23 is such that the piston-arm 15 titsproperly against such boundary as it passes across the opening betweencylinders 2 and 3, the recess 24 substantially acting as the Wall of thecylinder 2. As the piston-arm 15 passes across `the opening betweenthe-cylinders 2 and 3 that part` of the member 23 which previouslyformed the abutment recedes, and its place is `taken by an adjoiningsimilar part of member 23, one of the ports 25, which formerlyconstituted the outlet-port, becoming theinlet-port, having passedacross the unrecessed part of the conduit 26 to the port 28. This changeof abutments and also from the time the medium is cut oit until it isturned on again the interval is very short, as this occurs at the timeof the maximum rotation of the member 23.` The medium is cut ott by thetime the edge of theabutment leaves the piston 13 and is again turned onas the edge of the adjoining abutment engages said piston 13, when it isin position to allow it to exercise its full force on the pistonarm 15.When the engine is running under certain conditions and there is notenough force to carry the piston-arm 15 across this interval, a{1y-Wheel may be used or two or more` such engines properly put on asingle shaft.` Although the abutment sustains the reaction of the mediumused, there is no tendency of the member 23 to rotate, suchpressurebeing equalized by the pressure on the opposite side of the same recess24, the reaction acting substantially radially against the hub 7 andthere being no force tending to hinder the rotation of the member 23other than friction. The ports 25 and 28 .are shown registering full inFig. 1 When the member 23 is at rest; but in Fig. 13 the port 28 isturned so that it registers only partly with one of the ports 25, inwhich case the expansion of the medium can be used if desired.

When it is desired to stop the engine, the conduit or member 26 isturned so that its port 28 Will lie substantially in the plane of theaxes of the two rotary members, Whereupon during the further rotation ofthe piston under the expansive energy of the steam 8 5 such port 28 willregister With one of the ports 25 only When such port 25 and thepiston-arm are in the same plane as the port 28, so that the passage ofsteam through the port 25 will be cut oft' by the end of the piston-arm.Upon turningthe conduit 26 so that the port 28 will register with theport 25, which in the previous cycle of operation constituted theeXhaust-port,'rthe engine Will be reversed.

One form of this invention is here shown and described; but it may bemodified in many Ways, some of which modiiications will now be pointedout.

In Fig. 8 a modification is shown in which the piston 13 has terminalheads 32, provided With suitable packing-rings 33, the partition 8 incylinder 2 being dispensed with. In this case the member 23 revolvesbetween the heads 32, and the disk 16 is made integral with thecylindrical portion 14 of the piston 13 on the outside of one of theterminal heads 32.

In Figs. 10 and 11 the stud`19 and the slots 22 may be dispensed withand the disk 18 simply provided With the curved recess 21. In this casethe periphery ot' the piston-arm 15 is the actuating cause of thepartial rotation of the member 23. The disks 16 and 18 may be placed, ifdesired, on the shaft 5 and hub 7 at a distance away from the cylinders2 and 3 and may be provided with a suitable casing.

Any suitable form of packing or packingrings may be used and may beplaced as required by the particular construction of the improvementadopted; but the form of packing shown, Fig. 9, which may be thepreferred form, if desired, comprises a T-shapedstrip 36, provided alongits broad portion with a spring 37, Which may be a corrugatedleafspring, and inverted -T-shaped grooves 38 may be provided to receivesuch strips, the springs 37 tending to force such packing against theWalls of the cylinder outwardly.

I have described and shown my invention moreA particularly as animproved. rotary engine; but it may be used-also for many otherpurposes-such, for instance, as .a pump for liquids or a meter.

I-Iaving described my invention, I claim- IOO TIO

l1. In a rotary motor, the combination of a cylinder; a chamber openinginto said cylinder; an intermittently-rotary member in said chamberhaving recesses in its periphery; a rotary piston in said cylinderhaving an arm provided with substantially straight sides and a curvedend,said arm projecting successively into said recesses substantiallyits entire length during one part of its rotation and having its curvedend engaging successive parts of the walls of each of said recessesduring each partial rotation of said rotary member.

2. In a rotary motor, the combination of a cylinder; a chamber openinginto said cylinder; an intermittently-rotary member in said chamberhaving curved recesses in its periphery each provided with a portcommunicating with the interior of said member; a rotary piston in saidcylinder having an arm provided with substantially straight sides and acurved end, said arm projecting successively into said recessessubstantially its entire f length during one part of its rotation andhavcylinder; a rotary piston therein having an ing its curved endengaging successive parts of the wall of each of said recesses duringeach partial rotation of said rotary member, the organization being suchthat the walls of the recess into which the arm projects form acontinuation of the walls of the cylinder and those portions of theperiphery of said member intermediate said recesses form successiveabutments between the rotations of said member.

3. In a rotary motor, the combination of a cylinder; a chamber' openinginto said cylinder; au intermittently-rotary member in said chamberhaving substantially parabolicallycurved recesses in its periphery eachprovided with a port communicating with the interior of said member; arotary piston in said cylinder, having an arm provided withsubstantially straight sides and a curved end, said arm projectingsuccessively into said recesses substantially its entire length duringone part of its rotation and having its curved end engaging successiveparts of the wall of each of said recesses during each partial rotationof said rotary member, the organization being such that the walls of therecess into which the arm projects form a continuation of the walls ofthe cylinder and those portions of the periphery, of said memberintermediate said recesses form successive abutments between therotations of said member.

4. In a rotary motor, the combination of a arm; a chamber opening intosaid cylinder; an intermittently rotarymember in said chamber havingrecesses in its periphery, each having its wall continuously curved fromend to end and adapted during the rotation of said member to receive thepiston and form continuations of the walls of said cylinder, thoseportions of the periphery of said member intermediate said recessesforming successive abutments between the rotations of said rotarymember, the end of said piston-arm engaging successively the curvedportions of a recess at each rotation of the piston.

5. In a rotary motor, the combination of a cylinder; a rotary pistontherein; a chamber opening into said cylinder; an intermittentlyrotary,hollow member in said chamber, the said member having recesses in itsperiphery adapted during the rotation of said member to receive thepiston and form a continuation of the walls of said cylinder, and theportions of the periphery of said member intermediate said recessesforming successive abutments between the rotations of said member, saidrecesses and the interior of said member being `connected by ports; anda conduit projecting into said hollowr member and having on its exteriorlongitudinal recesses on opposite sides and a port on one sideintermediate such recesses, said port and one of said recesses adapted,when said conduit is in working position, to register with two of saidmembers ports. l

6. In a rotary motor, the combination of a cylinder; a rotary pistontherein; a chamber openinginto said cylinder; an intermittentlyrotary,hollow member in said chamber, the said member having recesses in itsperiphery adapted during the rotation of said member to receive thepiston and form a continuation of the walls of said cylinder, and theportions of the periphery of said member intermediate said recessesforming successive abutments between the rotations of said member, saidrecesses and the interior of said member being connected by ports; and atubular conduit projecting into said hollow member and hav` ing on itsexteriorlongitudinal recesses on opposite sides and a port on one sideintermediate such recesses, said port and one of said recesses adapted,when saidconduit is inyvorking position,to register with two ofsaidmembers ports.

7. In a rotary motor, the combination of a cylinder; a shaft mountedtherein; a rotary piston carried by said shaftand havingan arm; achamber openinginto said cylinder; a rotary memberin said chamber havingrecesses in its periphery each having its wall continuously curved fromend to end and adapted during the rotation of said member to receive thepiston and form contin uations of the walls of said cylinder, thoseportions of the periphery of said member intermediate said recessesforminglsuccessive abutments between the rotations of said member, theend of said pistonarm engaging successively the curved portions of arecess at each rotation of the piston;

and means carried by said shaft and operatively connected with saidrotary member for causing said member to make a partial rotation foreach complete rotation of said piston.

8. In a rotary motor, the combination of a cylinder; a shaft mountedtherein; a rotary piston carried by said shaft; a chamber opening intosaid cylinder; a rotary member in said chamber and having a hub, saidmember having recesses in its periphery adapted dur- IOO IIO

IZO

ing the rotation of said member toreceive vthe piston and form acontinuation of the Walls of said cylinder, and the portions of theperiphery of said member intermediate said recesses forming successiveabutments between the rotations of said member, said recesses and theinterior of said hub being connected by ports; means carried by saidshaft and said hub for causing said member to make a partial rotationfor each complete rotationl of said piston; and a conduit having on itsexterior longitudinal recesses on opposite sides and a port on one sideintermediate such recesses, said port and one of said recesses adapted,when said conduit is in working position, to register with two of saidmembers ports.

9.` The combination of a pair of intersecting cylinders; and a rotarymember located in each of said cylinders, such members organized one tomake a partial rotation for each complete rotation of the other member,and one of such members provided with a piston and the other providedwith recesses in its periphery each having its wall continuously curvedfrom end to end and adapted to form continuations of the walls of thepiston-cylinder and a steam-tight joint with the end of said pistonduring the rotation of said recessed member, said recessed member havingports communicating with said recesses, the partial rotation of suchrecessed member controlling such ports.

`10. The combination of a pair of intersecting cylinders; a rotarymember located in each of said cylinders, such members organized one tomake a partial rotation for each complete rotation of the other member,and one of such members provided with a piston and the other providedwith recesses in its periphery, each having its wall continuously curvedfrom end to end and adapted to form continuations of the Walls of thepiston-cylinder and a steam-tight joint with the end of said `pistonduring the rotation of said recessed member, said recessed member havingports communicating with said recesses, the partial rotation of suchrecessed member controlling such ports; aslotted disk operativelyconnected with said recessed member; and a member operatively connectedwith the piston and provided with a device adapted to enter said slots,said disk and member having cooperating parts adapted to lock therecessed member against rotation at predetermined periods. i

1l. In a rotary motor, the combination of a cylinder; a rotary pistontherein; a rotatable abutment having a tubular hub and a plurality ofrecesses for the reception of said piston and for the replacement of thewalls of said cylinder d-uring the rotation of said abutment, and withports connecting said recesses with the interior of said hub; and aconduit having on opposite sidesof its exterior longitudinal recessesand on one side intermediate such recesses a port, said port and one ofsaid recesses adapted to register with two of said hubs ports at eachrotation.

12. In a rotary motor, the combination of a cylinder; a rotary pistontherein; arotatable abutment having a tubular hub and a plurality ofrecesses for the reception of said piston and for the replacement of theWalls of said cylinder during the rotation of said abutment, and withports connecting said recesses with the interior of said hub; and atubular conduit having on opposite i sides of its exterior longitudinalrecesses and on one side intermediate such recesses a port, said portand one of said recesses adapted to register with two of said hubs portsat each rotation.

`13. The combination, with two intersecting cylinders and a rotarymember located in each of said cylinders, one of said rotary membershaving a tubular hub provided `with ports and adapted to rotate apredetermined distance for each complete rotation of the other rotarymember, of a tubular conduit projecting into said hub and having on itsexterior surface longitudinal recesses on opposite sides and a portonone side intermediate such recesses, said port and one of said recessesadapted when the conduit is in working position to register with two otthe ports in the rotary member, and means for operating said conduit.

14. The combination, with two intersecting cylinders and a rotary memberlocated in each of said cylinders, one of said rotary members having atubular hub provided with ports and adapted to rotate a predetermineddistance for each complete rotation of the other rotary member, of amember located in said hub and having on its exterior surfacelongitudinal recesses on opposite sides and a port on one sideintermediate such recesses, said port and one of said recesses adapted,when said member is in Working position, to register with two of theports in the rotary member, and means for operating said member.

l5. In a rotary motor, the combination of a cylinder; a rotary pistontherein having an arm; a chamber opening into said cylinder; a rotatableabutment in said chamber having a hub provided with ports, said abutmenthaving recesses adapted to receive said piston-arm as said abutmentrotates; a member located in said hub and having a port and a pair ofrecesses one at each side of' said port, the former communicating withthe interior of said member, said port and a recess adapted to registerwith two of the ports in said hub; a slotted disk operatively connectedwith said abutment; and a member operatively connected with the pistonand provided with a device adapted to enter said slots, said disk andmember having cooperating parts adapted to lock the abutment againstrotation at predetermined periods.

IOO

16. In a rotary motor, the combination of a cylinder; a rotary pistontherein provided across its ends and along its sides withinverted-T-shaped packing-grooves; a rotatable abutment provided withsimilar inverted- T-shaped packing-grooves and having a tubular hub andprovided with a plurality of recesses adapted to receive said piston assaid abutment rotates and forming a plurality of abutments successivelyreplacing each other during the rotation of said abutment and with portsconnecting said recesses and hub; a conduit projecting into said hub andhaving on opposite sides of its exterior longitudinal recesses and onone side intermediate said recesses a port, said port and one of saidrecesses adapted to register with two of said hubs ports; aradially-slotted disk mounted on one end of said hub, said disk havingportions of its periphery intermediate said slots rentrant; a membercarried by theipiston and provided with a stud adapted to enter saidslots and with a portion adapted to engage the rentrant portions of saiddisk; and spring-controlled T-shaped packing adapted to fit in saidpacking-grooves.

17. The combination of a pair of intersecting cylinders; a rotary pistonlocated in one of said cylinders and an intermittently-rotary member inthe other of said cylinders; a member operatively connected with saidintermittently-rotary member, each of said members having recesses, therecesses of one member having a different formation from the recesses ofthe other member, and said intermittently-rotary member having itsrecesses communicating With ports and forming abutments effective tosuccessively replace each other during the rotation of said member;means operatively connected with the piston and cooperating with therecesses of the other member for imparting intermittent rotary movementto said intermittently-rotary member, said parts also having cooperatingportions effective to lock the intermittently-rotary member againstmovement at predetermined periods; and a member located interiorly ofsaid intermittently-rotary member and provided with a port'communicating With the ports of said member, and with a pair oflongitudinally-extending recesses one at each side of said port.

18. The combination of a pair of intersecting cylinders; a rotary pistonlocated in one of said cylinders and an intermittently-rotary member inthe other of said cylinders; a member operatively connected with saidintermittently-rotary member, each of said members having recesses, therecesses of one member havinga different formation from the recesses ofthe other member, and said intermittentlyrotary member having itsrecesses communieating With ports and forming abutments effective tosuccessively replace each other during the rotationof said member; meansoperatively connected With the piston and cooperating with the recessesof the other member for imparting intermittent rotary movement to saidintermittently-rotary member, said parts also having cooperatingportions effective to lock the intermittently-rotary member againstmovement at predetermined periods; a member located interiorly of saidintermittently-rotary member and provided with a port communicating Withthe ports of said member and With a pair of longitudinally-extendingrecesses one at each side of said port; and means for rotating saidmember to reverse or stop the engine.

19. In a rotary motor, the combination of a cylinder; a rotary pistontherein having an arm; a chamber opening into said cylinder; and anintermittently-rotary member in said chamber having recesses in itsperiphery forming abutments adapted successively t0 replace each otherduring the rotation of said member, the organization being such that theWall of each recess Will be at a predetermined period in position toconstitute a continuation of the Wall of the cylinder so that the end ofsaid piston-arm will, as it passes from the cylinder-Wall, engage theWall of one of said recesses and such end continue to engage successiveportions of such Wall until it passes from such recess into engagementwith the cylinder-Wall proper, whereby the end of the piston-arm vWillbe in engagement with some part of the cylinder-Wall during its entirerotation.

20. In a rotary motor, the combination of a cylinder; a rotary pistontherein having an arm; a chamber opening into said cylinder; anintermittently rotary member in said chamber having recesses in itsperiphery forming abutments adapted successively to replace each otherduring the rotation of said member, the organizationl being such thatthe Wall of eachrecess Will be at a predetermined period in position toconstitute a continuation of the Wall of the cylinder so that the end ofsaid piston-arm will, as it passes from the cylinder-Wall, engage theWall of one of said recesses and such end continue to engage successiveportions of such wall until it passes from such recess into engagementwith the cylinder-Wall proper, whereby the end of the piston-arm will bein engagement With some part of the cylinder-Wall during its entirerotation; and means in operative connection with such piston and rotarymember for imparting intermittent rotary movement to said member andhaving cooperating parts effective to lock said member against movementat predetermined periods.

2l. The combination with two intersecting cylinders, of a rotary memberlocated in each of said cylinders, one of said members having a pistonand the other of said members having recesses with which said pistoncooperates and having its hub provided With ports communicating Withsaid recesses, and adapted to be rotated a predetermined distance forIIO , each complete rotation of the other rotary the end of saidhub,said port and said recess memberg. a tubular member located in saidadapted when said member is in working pohub and having a portcommunicating With sition to register With ports in said hub. theinterior of said member, and also having SINCLAIR J. JOHNSON.

a lon gitudnally-extendng recess out off from Witnesses: communicationwith the interior of said mem- FRED. J. DOLE, ber by a Wall of saidmember and opening at C. E. VOSS.

